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    ddr2 memory

    Discussion in 'Hardware Components and Aftermarket Upgrades' started by junglemonkey, Jul 9, 2009.

  1. junglemonkey

    junglemonkey Newbie

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    i saw a laptop with an intel P7350 3MB L2 1067MHZ FSB....
    it had 4GB DDR2 memory at 667MHZ

    isnt the memory MHZ supposed to be at least the same 1067MHZ as the cpu FSB?
    i mean it seems that the memory is running slower than the cpu and will slow things down.

    what am i missing here?
     
    junglemonkey, Jul 9, 2009
    #1
  2. moral hazard

    moral hazard Notebook Nobel Laureate

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    no, the fsb is 266mhz while the ram is 333mhz.
    the ram has more bandwidth then the cpu can handle.
     
    moral hazard, Jul 9, 2009
    #2
  3. namaiki

    namaiki "basically rocks" Super Moderator

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    http://forum.notebookreview.com/showthread.php?p=5041729#post5041729
    For more info on the numbers. :D

    QDR = Quad Data Rate
    DDR = Double Data Rate


    FSB theoretical bandwidth: 8533MB/s
    RAM theoretical bandwidth: 10667MB/s

    RAM actual (on my laptop): 5850MB/s which is less than both so neither is a bottleneck. :p

    edit: 10667MB/s for dual channel (usually enabled if you have two sticks of RAM installed). 5333MB/s for single channel PC2-5300/667MHz.
     
    namaiki, Jul 9, 2009
    #3
  4. davidkneiber

    davidkneiber Notebook Consultant

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    no... as i learned earlier the two dont effect each other!
     
    davidkneiber, Jul 14, 2009
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  5. fizzyfanta

    fizzyfanta Notebook Guru

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    For optimal performance you should run the fsb:mem on a core2 synchronously.
     
    fizzyfanta, Jul 14, 2009
    #5
  6. sgogeta4

    sgogeta4 Notebook Nobel Laureate

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    Ultimately, that makes no difference in real life performance.
     
    sgogeta4, Jul 14, 2009
    #6